Bracket Walk

data structures, greedy, strings

Editorial for Two

binary search, data structures, greedy, implementation

Playoff Fixing

combinatorics, trees

Lottery

binary search, brute force, greedy, math, two pointers

Typewriter

brute force, math

MEX of LCM

binary search, data structures, implementation, math, number theory

Combinatorics Problem

brute force, combinatorics, dp

Red-Blue Operations (Hard Version)

binary search, constructive algorithms, greedy, implementation, math

Red-Blue Operations (Easy Version)

binary search, greedy, implementation, math

Hyperregular Bracket Strings

combinatorics, greedy, hashing, math, number theory, sortings

The BOSS Can Count Pairs

brute force, math

Range Sorting (Hard Version)

binary search, data structures, dp, greedy

Range Sorting (Easy Version)

binary search, dp, dsu, greedy, trees, two pointers

Walk the Runway

bitmasks, brute force, data structures, dp, graphs, implementation, sortings

LuoTianyi and XOR-Tree

data structures, dfs and similar, dp, dsu, greedy, trees

LuoTianyi and the Floating Islands (Hard Version)

combinatorics, dfs and similar, math, probabilities, trees

Removing Graph

brute force, dp, games, graphs, math

Magic Triples (Hard Version)

brute force, data structures, math, number theory

Rearrange Brackets

brute force, dp, greedy, sortings, strings

The Fox and the Complete Tree Traversal

constructive algorithms, dp, implementation, math, trees

Similar Polynomials

combinatorics, math

Between

constructive algorithms, dfs and similar, graphs, greedy

Sum Graph

brute force, constructive algorithms, graphs, implementation, interactive, shortest paths, trees

Chain Chips

data structures, dp, matrices

Balancing Weapons

binary search, brute force, data structures, math, two pointers

Vlad and the Nice Paths (hard version)

binary search, combinatorics, data structures, dp, math, two pointers

Vlad and the Nice Paths (easy version)

combinatorics, dp, math

Is It Flower?

dfs and similar, graphs, implementation

Monsters

brute force, data structures, dfs and similar, dsu, graphs, greedy

Traveling in Berland

binary search, data structures, graphs, greedy, implementation

Two Tanks

binary search, dp, implementation, math

Minibuses on Venus (medium version)

combinatorics, divide and conquer, dp, matrices

Minibuses on Venus (easy version)

combinatorics, divide and conquer, dp

Petya, Petya, Petr, and Palindromes

binary search, brute force, data structures, two pointers

Tree Master

brute force, data structures, dfs and similar, trees

DSU Master

combinatorics, dp, dsu, math

There Should Be a Lot of Maximums

brute force, data structures, dfs and similar, dp, trees, two pointers

Routing

bitmasks, brute force, dfs and similar, dp, graphs

Accommodation

brute force, dp, greedy, implementation

The way home

binary search, data structures, dp, graphs, greedy, shortest paths, sortings

Symmetree

dfs and similar, hashing, implementation, trees

City Union

constructive algorithms, dfs and similar, dsu, geometry, greedy, implementation, math

Hot Start Up (hard version)

data structures, dp

Gifts from Grandfather Ahmed

dp, math, number theory

Multitest Generator

brute force, dp

Li Hua and Array

brute force, data structures, dsu, math, number theory, two pointers

Colored Subgraphs

dfs and similar, dp, games, greedy, trees

Maximum Subarray

data structures, dp, greedy, two pointers

Blocking Chips

binary search, constructive algorithms, dfs and similar, greedy, trees

Explosions?

binary search, data structures, dp, greedy, math

Labeling the Tree with Distances

data structures, dp, greedy, hashing, implementation, trees

Divisors and Table

brute force, dfs and similar, dp, number theory

Tokens on Graph

constructive algorithms, dfs and similar, graphs, shortest paths

Timofey and Black-White Tree

brute force, dfs and similar, divide and conquer, graphs, greedy, math, shortest paths, trees

Serval and Music Game

brute force, dp, implementation, math, number theory

Serval and Shift-Shift-Shift

bitmasks, brute force, constructive algorithms, implementation

XOR, Tree, and Queries

bitmasks, constructive algorithms, dfs and similar, dsu, graphs, greedy, implementation, trees

Sum Over Zero

data structures, dfs and similar, dp

Moving Dots

binary search, brute force, combinatorics, math, two pointers

Inverse Transformation

constructive algorithms, implementation, math

The Harmonization of XOR

bitmasks, constructive algorithms, greedy, math

Wooden Spoon

combinatorics, dp

Monsters (hard version)

data structures, greedy

Double Sort II

dfs and similar, flows, graph matchings, graphs

Game of the Year

brute force, data structures, math, number theory

Different Arrays

brute force, dp, implementation

Rectangle Shrinking

binary search, brute force, data structures, greedy, implementation, two pointers

Delicious Dessert

binary search, dsu, hashing, math, number theory, string suffix structures

Three Chairs

bitmasks, brute force, combinatorics, data structures, dp, number theory, sortings

Josuke and Complete Graph

binary search, brute force, data structures, math, number theory

Xorcerer's Stones

bitmasks, constructive algorithms, dp, trees

Anya's Simultaneous Exhibition

constructive algorithms, graphs, greedy, interactive, sortings

The Tree Has Fallen!

bitmasks, dfs and similar, math, trees

Flexible String Revisit

combinatorics, dp, math, probabilities

Comfortably Numb

bitmasks, data structures, divide and conquer, strings, trees

Edge Reverse

binary search, dfs and similar, graphs, trees

Italian Data Centers

graphs, shortest paths

Spinach Pizza

games, geometry, greedy, interactive

Another Wine Tasting Event

combinatorics, constructive algorithms, math, strings

Library game

games, greedy, interactive, sortings

Vittorio Plays with LEGO Bricks

dp, geometry

Laboratory on Pluto

constructive algorithms, dp, greedy, math

The Human Equation

greedy, implementation

Magician and Pigs (Easy Version)

brute force, data structures, implementation

Interactive Factorial Guessing

brute force, games, implementation, interactive

BinCoin

binary search, divide and conquer, hashing, implementation, probabilities, trees

Gaining Rating

binary search, greedy, implementation, math, sortings, two pointers

Copy of a Copy of a Copy

constructive algorithms, dfs and similar, graphs, implementation, sortings

Hossam and Range Minimum Query

binary search, bitmasks, data structures, hashing, probabilities, strings, trees

Hossam and a Letter

brute force, dp, implementation, two pointers

Hossam and (sub-)palindromic tree

brute force, data structures, dfs and similar, dp, strings, trees

Koxia and Tree

combinatorics, dfs and similar, dp, dsu, math, probabilities, trees

Koxia and Game

constructive algorithms, data structures, dfs and similar, dsu, flows, games, graph matchings, graphs, implementation

Игра в Девятку III

*special problem, brute force

Игра в Девятку II

*special problem, brute force

Partial Sorting

combinatorics, math, number theory

Algebra Flash

bitmasks, brute force, dp, graphs, math, meet-in-the-middle, trees

Count Binary Strings

data structures, dp

Decomposition

binary search, brute force, data structures, divide and conquer, dp, two pointers

Project Manager

brute force, data structures, implementation